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ARS Home » Pacific West Area » Burns, Oregon » Range and Meadow Forage Management Research » Research » Publications at this Location » Publication #213600
Title: INTERACTIONS BETWEEN EVAPO-TRANSPIRATION AND ECOLOGICAL CHANGES IN JUNIPER WOODLANDS

Author
item Svejcar, Anthony

Submitted to: Society of Range Management
Publication Type: Abstract Only
Publication Acceptance Date: 1/1/2007
Publication Date: 2/1/2007
Citation: Svejcar, A.J. 2007. Interactions between evapo-transpiration and ecological changes in juniper woodlands [abstract]. Society of Range Management. Paper No. 421.

Interpretive Summary:

Technical Abstract: THE EXPANSION OF JUNIPER SPECIES INTO GRASSLAND AND SHRUB-STEPPE COMMUNITIES HAS OCCURRED ACROSS VAST AREAS AND AT A GLOBAL SCALE. IN MANY CASES WE HAVE DEVELOPED A REASONABLE UNDERSTANDING OF THE ECOLOGICAL OR SUCCESSIONAL CHANGES THAT ARE LIKELY WITH THE EXPANSION. IMPACTS ON EVAPO-TRANSPIRATION (ET) AND WATER BUDGETS IN GENERAL ARE NOT SO CLEARLY DEFINED. SUCCESSION FROM GRASSLAND OR SHRUB-STEPPE TO JUNIPER WOODLAND CLEARLY IMPACTS VEGETATION STRUCTURE AND A HOST OF PARAMETERS THAT INFLUENCE ET. AMONG THE FACTORS TO CONSIDER ARE: LEAF AREA INEX, TRANSPIRATION RATE AND AMOUNT, SEASONAL TIMING OF TRANSPIRATION, MICROCLIMATE CHANGES, INTERCEPTION OF PRECIPITATION, SNOW DISTRIBUTION, AND SURFACE HYDROLOGY. MANY OF THESE FACTORS ARE LINKED. DIRECT INFORMATION ON ET CHANGES WITH SUCCESSION IS VERY LIMITED, BUT I WILL REVIEW WHAT IS CURRENTLY KNOWN ABOUT CHANGES IN THE FACTORS THAT ARE LIKELY TO INFLUENCE ET.